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Flash EEprom system    
United States Patent5602987   
Link to this pagehttp://www.wikipatents.com/5602987.html
Inventor(s)Harari; Eliyahou (Los Gatos, CA); Norman; Robert D. (San Jose, CA); Mehrotra; Sanjay (Milpitas, CA)
AbstractA system of Flash EEprom memory chips with controlling circuits serves as non-volatile memory such as that provided by magnetic disk drives. Improvements include selective multiple sector erase, in which any combinations of Flash sectors may be erased together. Selective sectors among the selected combination may also be de-selected during the erase operation. Another improvement is the ability to remap and replace defective cells with substitute cells. The remapping is performed automatically as soon as a defective cell is detected. When the number of defects in a Flash sector becomes large, the whole sector is remapped. Yet another improvement is the use of a write cache to reduce the number of writes to the Flash EEprom memory, thereby minimizing the stress to the device from undergoing too many write/erase cycling.
   














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Drawing from US Patent 5602987
Flash EEprom system - US Patent 5602987 Drawing
Flash EEprom system
Inventor     Harari; Eliyahou (Los Gatos, CA); Norman; Robert D. (San Jose, CA); Mehrotra; Sanjay (Milpitas, CA)
Owner/Assignee     SanDisk Corporation (Sunnyvale, CA)
Patent assignment
All assignments
Publication Date     February 11, 1997
Application Number     08/174,768
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     December 29, 1993
US Classification     714/8 365/200 365/210 711/100
Int'l Classification     G06F 011/00
Examiner     Beausoliel Jr.; Robert W.
Assistant Examiner     Hua; Ly V.
Attorney/Law Firm     Majestic, Parsons, Siebert & Hsue
Address
Parent Case     CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of application Ser. No. 07/963,838, filed Oct. 20, 1992, now U.S. Pat. No. 5,297,148, which in turn is a division of original application Ser. No. 07/337,566, filed Apr. 13, 1989, now abandoned, which are hereby incorporated herein by this reference.
Priority Data    
USPTO Field of Search     371/10.2 371/10.3 371/40.1 365/200 365/185.09 365/201 365/189.07 395/575 395/182.03 395/182.04 395/182.05 395/182.06 395/427 395/430
Patent Tags     flash eeprom
   
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 References Submit all comments and votes
 
*references marked with an asterisk below are user-added references
 U.S. References
 
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ReferenceRelevancyCommentsReferenceRelevancyComments
5297148
Harari

Mar,1994
[0 after 0 votes]		5226168
Kobayashi
703/25
Jul,1993
[0 after 0 votes]
5095344
Harari
257/328
Mar,1992
[0 after 0 votes]		5070474
Tuma

Dec,1991
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5053990
Kreifels
711/103
Oct,1991
[0 after 0 votes]		5043940
Harari
365/185.03
Aug,1991
[0 after 0 votes]
4953122
Williams
711/4
Aug,1990
[0 after 0 votes]		4949309
Rao
365/185.12
Aug,1990
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4949240
Iijima
707/102
Aug,1990
[0 after 0 votes]		4945535
Hosotani
714/8
Jul,1990
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4942556
Sasaki
365/200
Jul,1990
[0 after 0 votes]		4924331
Robinson
360/72.1
May,1990
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4920518
Nakamura
365/228
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Bonke
360/48
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Wayama
710/65
Jan,1990
[0 after 0 votes]		4887234
Iijima
711/173
Dec,1989
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4800520
Iijima
707/206
Jan,1989
[0 after 0 votes]		4796233
Awaya
714/710
Jan,1989
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Lim
365/185.09
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Lavelle
365/52
Nov,1988
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Satoh
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Sep,1988
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Fukushi
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Robinson

May,1988
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Giebel
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Baglee
365/185.22
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Takemae
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Smith
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Dutton
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Foster
703/24
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Ip
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Goodman
711/2
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Sato
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Mehrotra
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Sep,1986
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Walker
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Nibby, Jr.
714/8
Jul,1985
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Nozawa
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Hagiwara
365/185.09
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Martinez
711/115
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Anderson
714/711
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Ryan
714/702
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Haeusele
365/200
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Fukuda
703/25
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Bond
714/6
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[0 after 0 votes]		4422161
Kressel
365/185.09
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Slakmon
360/49
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[0 after 0 votes]		4380066
Spencer
714/6
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Gould
365/200
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[0 after 0 votes]		4354253
Naden
365/15
Oct,1982
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Kunstadt
711/200
Oct,1981
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McKenny
365/200
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Schrenk
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Jul,1981
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Tsang
365/200
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Wozniak
710/74
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Das

Jun,1978
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Choate
714/711
Sep,1977
[0 after 0 votes]		3633175
Harper
711/108
Jan,1972
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Market Size
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$5B - $10B
$2B - $5B
$500M - $2B
$100M - $500M
$10M - $100M
$1M - $10M
$500K - $1M
$100K - $500K
< $100K
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$0
 
$0   $2.5B   $5B   $7.5B   $10B
Market Share
Estimate the percentage of the relevant market sector this invention will capture:
75% - 100%
50% - 74.99%
25% - 49.99%
10 - 24.99%
5 - 9.99%
2 - 4.99%
1 - 1.99%
< 1%
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0.0%
 
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Reasonable Royalty
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50% - 74.99%
25% - 49.99%
10 - 24.99%
5 - 9.99%
2 - 4.99%
1 - 1.99%
< 1%
[No votes]
0.0%
 
0%   25%   50%   75%   100%
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